Strength, thermal defects, and solid solution hardening in nickel-containing B2 iron aluminides

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Nickel-containing ternary iron aluminides with an aluminum concentration of 45 at.% were investigated with respect to room temperature strength, equilibrium vacancy concentration, and the kinetics of vacancy removal. As compared to binary iron aluminides with the same Al concentration, nickel additions reduce the thermal equilibrium vacancy concentration at 1,273 K, whereas they increase this concentration at 973 K. Furthermore, at low temperatures such as 673 K, nickel additions increase dramatically the time needed to reach vacancy equilibrium. During prolonged annealing at 673 K, the density of <001> dislocations in Fe-45Al-3Ni (at.%) increased by an order of magnitude. This suggests that ... continued below

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7 p.

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Schneibel, J.H.; Munroe, P.R. & Pike, L.M. December 31, 1996.

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  • Schneibel, J.H. Oak Ridge National Lab., TN (United States). Metals and Ceramics Div.
  • Munroe, P.R. Univ. of New South Wales, Sydney, New South Wales (Australia). School of Materials Science and Engineering
  • Pike, L.M. Univ. of Wisconsin, Madison, WI (United States). Dept. of Materials Science and Engineering

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Description

Nickel-containing ternary iron aluminides with an aluminum concentration of 45 at.% were investigated with respect to room temperature strength, equilibrium vacancy concentration, and the kinetics of vacancy removal. As compared to binary iron aluminides with the same Al concentration, nickel additions reduce the thermal equilibrium vacancy concentration at 1,273 K, whereas they increase this concentration at 973 K. Furthermore, at low temperatures such as 673 K, nickel additions increase dramatically the time needed to reach vacancy equilibrium. During prolonged annealing at 673 K, the density of <001> dislocations in Fe-45Al-3Ni (at.%) increased by an order of magnitude. This suggests that dislocations act as sinks for vacancies. At the same time, the number density of small (20--50 nm) voids decreased, indicating that they were not stable in the absence of substantial vacancy supersaturations. The findings show also that the solid solution strengthening of iron aluminides due to Ni is much weaker than previously thought.

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7 p.

Notes

OSTI as DE97002633

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  • 1996 Fall meeting of the Materials Research Society (MRS), Boston, MA (United States), 2-6 Dec 1996

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  • Other: DE97002633
  • Report No.: CONF-961202--60
  • Grant Number: AC05-96OR22464
  • DOI: 10.2172/432988 | External Link
  • Office of Scientific & Technical Information Report Number: 432988
  • Archival Resource Key: ark:/67531/metadc685828

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  • December 31, 1996

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  • July 25, 2015, 2:20 a.m.

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  • Jan. 22, 2016, 4:45 p.m.

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Schneibel, J.H.; Munroe, P.R. & Pike, L.M. Strength, thermal defects, and solid solution hardening in nickel-containing B2 iron aluminides, report, December 31, 1996; Tennessee. (digital.library.unt.edu/ark:/67531/metadc685828/: accessed April 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.